Finishing-machine for the periphery of piston-rings.



D. F. DOIVIZI.

FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS. APPLICATION FILED AUGJT. I912 RENEWED MAY 26, I915.

1.,162,51I. Patented Nov. 30, 1915.

I0 SHEETS-SHEET I.

BELT TO POWER HZMOd OJ. I135 D. F. DOMIZI.

FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS. APPLICATION FILED AUGJI. 1912. RENEWED MAY 26, 1915.

1,162,581.. I Patented Nov. 30,1915.

I0 SHEETS-SHEET 2- V n. F. DOMIZL FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS.

APPHCATI ON FILED AUG- 17. I912. RENEWED MAY 26, I9l5 m m m l m OH. O 0 W F. m m w V P A D Qm\ VN\ WNx wizlmmw .D. F. DOMIZI.

FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS. APPLICATION FILED AUG. 11, 1912. RENEWED MAY 26. 1915.

1,162,581. r E Patented Nov; 30, 1915.

I0 SHEETS-SHEET 4- DAV/D Ff DOM/Z! D. F. DOIVIIZI. FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS.

- I912. RENEWED MAY 26.1915.

APPLICATION FILED AUG- I7 Patented Nov. 30, 1915.

I0 SHEETS-SHEET 5.

ENE

DAV/D DOM/Z! abtomwq IIIIIIIIIIIIIIIIIIIIIIIE inil'rlfi 1 D. F. DOMIZI. FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS.

APPLICATION FILED AUG. 1], I9I 1,162,1.

Z RENEWED MAY 26,1915.

Patented Nov. 30, 1915.

I0 SHEETSSHEET 6- r/ :5. i OM. Q n\ .mwgk m\/ 9 N Q/J I {I T I NIRIIIII I Iii- Q m 9 Q WITNESSES D. F. DOMIZI. FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS.

APPLICATION FILED AUG. 17. I912- RENEWED MAY 26,1915.

Patented Nov. 30, 1915.

I0 SHEETS-SHEET 7- gwue/wtoz DAV/D f DOM/Z! D. F. DOMIZI.

FINISHING MACHINE FOR THE PERIPHERY OF PISTON RINGS. APPLICATION FILED AUG. I7. 1912. RENEWED MAY 26.1915.

1,1 62,581 Patented Nov. 30, 1915.

10 SHEETS-SHEET 8- o I I\ l I i III IIIIII I k I Q Q awvewto a DAV/D F. DOM/Z! D. F. DOMIZI.

Patented Nov. 30, 1915.

I0 SHEETS-SHEET 9- FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS.

APPLICATION FILED AUG-17. I912- RENEWED MAY 25. 1915. 1,162.51.

I D. F. DOMIZI. FINISHING MACHINE FOR THE PERIPHERY 0F PISTON RINGS. APPLICATION FILED AUG. 11, I9l2. RENEWED MAY 26,1915. 1,162,581. Patented Nov. 30, 1915.

I0 SHEETS-SHEET I0.

WITNESSES ATTORNEY To all whom it may concern:

DAVID F. DOMIZI, F FRANKLIN, PENNSYLVANIA.

FINISHING-MACHINE FOR THE PER-IPHERY OF PISTON-RINGS.

Specification of Letters Patent.

Patented Nov. 3(l ,1915.

Application filed August 17, 1912, Serial No. 715,601. Renewed May 26, 1915. seiiai No. 30,675.

Be it known that I, DAVID F. DOMIZI, a

' citizen of the United States, residing at Franklin, in the county of Yenango and State-of Pennsylvania, have lnvented certain new and useful Improvements 1n Fmishing-Machines for the Periphery of Piston-Rings, of which the following is a specification.

The object, construction and utility of my improved finishing machine for the periphcry of piston rings, are herein set forth with sufficient clearness to enable those skilled in the art to which it appertains, to make and use the same.

Ooject..The object of said invention is, to provide a machine wherewith the periphery of piston rings may be finished completcly,that is, both turned or tooled and also ground without rechucking the same or transferring the rings from one machine to another. Heretofore it has been the practice to turn such rings in one machine, then transfer them to another for the final finishing and grinding process, but the degree of accuracy which has recently become necessary in motors employing these rings, and especially those entering into the construction of automobiles, marineand agiation craft, has made it desirable that a method of finishing which is conducive to greater accuracy and speed should be employed. In the finishing of the best grade of such rings, the best results are obtained by turning them to a diameter that is a minute fractionof an inch-about one thousandth of an inchlarger than the required, final, finished size, then to removethe surplus stock by the process of grinding, and where the rings must be transferred to another machine and rechucked for the grinding operation, such rechucking must be'very accurately done, in order to place the ring so that its whole periphery will be subjected to the actio n of the grinding-wheel.

To avoid such rechucking is, therefore, the

particular object of. this invention, and to attain said object, I have provided a'machine which will perform the two operations upon the ring, and whereby rechucking is dispensed with.

Drawings.ln the drawings, which form a part of this application, I have shown one form of construction whereby my inventive idea is practically embodied, but said drawings are illustrative merely and are not intended to define the embodiment of this'invention by the precise construction there showns' Many-modifications could be employed without departing from the scope of of which both a revolving and longitudinally-reciprocating movement is imparted to the spindle. This View is taken from the opposite side of the machine to that shown in Fig. 1. 6 is a left end elevation of said gearing. Figs. 7 and 8 are details of said gearing. Fig. 9 is-a longitudinal section of the spindle of my machine. Fig. 10 is a detail of certain clutch-mechanism. Figs. 11, 12, 13 and 1e are details of the starting and stopping levers and the mechanismby which they are automatically actuated, Figs. 12 and 13 being sections on lines XIIXII and XIIIXIII respectively of Fig. 11. Figs. 15, 16 and 17 are details of the air-valves by means of which compressed air is controlled for the actuation of various clutches employed in my machine. Fig. 18 is a sectional view of a. clutch-actuating piston. Figs. 19 and 20 show the frame and bearings for the grinding-wheel, also the mechanism by which the same isadjusted. Figs. 21, 22, 23 and 24;

illustrate the'tool-holder and details therei of, as employed in this machine.

Construction-Briefly stated, my machine consists essentially of a revoluble, longitudinally-movable spindle, and means for imparting thereto said movements; said spindle being equipped at one end with a chuck for holding a piston-ring in such manner that the periphery of said ring is accessible for the desired operations thereon, and in addition to said spindle, tools for turning said periphery and an abrasive wheel for impartlng thereto a final finish; both of which operations are performed upon the ring while in its original position within? said chuck. As accessories to said essential elements, certain mechanism is provided for stoppin starting and governing ranged for the attachment of the chuck 4, ,which is preferably a pneumatically-actuated chuck, and more specifically, is the one shown and described in certain Letters Patent of the United States, issued to me on the 13th day of April, 1912, No. 1,024,882. Upon the outer end of said shaft, is rigidly afiixed a cylinder 5 containing a' pneumatically-actuated piston 6, to which is attached a rod' 7, that passes longitudinally through shaft .2, and is connected to and actuates the clamping mechanism of chuck 4. Said shaft 2 is mounted within a non-revoluble, longitudinally-reciprocable barrel 8, whichis ro-.

- vided with the adjustable bearings 9 an 10- for said shaft 2. Bearings 11 and 12 are provided within the bed 1. of the machine, for the reception of. said barrel, and in which it reciprocates freely. Dust-proof packing 13 excludes abrasive material from said bearin s.

The driving-gear 3 is for the purpose of revolving shaft 2 and the therein-contained chuck 4.

purpose of imparting a longitudinal or reciprocating movement to the spindle,

as a whole, I employ the following mechanism,see Fig. 5:Directly below the spindle-barrel 8, is revolubly-mounted I a cam-wheel 14, upon the ggriphery ofwhich is provided the cam 15. pon the barrel 8 is rigidly secured a collar 16, the under side of WlllCll is provided with a cam-roller or follower 17. As said cam-wheel revolves, cam 15 impinges uponsaid follower and thereby causes it to move in accordance with the sinuations of said cam, that is to say, so that the spindle moves longitudinally for a suflicient distance to cause the. piston-ring 18 m chuck 4 to be fed from the position shown in Fig. 2, past the tools T and the abrasivewheel W and back again to the original position, which is that shown in said ,Fig. 2.

The spindle and cam-wheel 14 are driven by a system of gearing shown especially in Figs. 5, 6, 7 and 8. The pulley 19 is a clutch-pulley and is belted to any suitable power, whereby it may be caused to revolve continuously while the machine'is in operat1on; said pulley 19 is loose uponits shaft 20; a clutch-member 21, which'is free to move"longitudinally upon shaft 20, but is .of the key 21,

non-revolubly connected thereto by means shaft and the gearing mounted thereon. Key 21 passes through the actuating-rod 22, and engages the hub of the cl1itch-mem will presently be described. A. stop-member 21" is provided with which member 21 may be engaged,-and when such engagement takes place, the machine is caused to stop instantly, so that the inertia of the moving parts cannot prolong'the stopping-action. A pinion 23 is feathered to shaft 20, and

from this, motion is transmitted to the spindle, through a train of gears consisting of the spur-gears 24, 25, 26 and 27. Gears 24 and 25 are adapted to obtain various'changes of speed, but this particular feature is comis adapted to engage said pulley 19 for the purpose of driving said.

monly employed in the art of machine-tool construction, hence it will not be described in detail. As previously stated, the spindle moves longitudinally, as does also gear 3, and to provide for this movement, pinion 27 is of vsufiicient length so that said gear 3 is always in mesh therewith, as it reciprocates. Motion is transmitted from said gear 27 to the cam-wheel, through a train of gears consistingof the spur-gear 28, miter-gears 29 and 30, spur-gears 31 and 32, and the worm 33 and worm-wheel 34. Said worm 33 is loose upon its shaft, and is formed at one endinto a clutch-member, as shown in dotted lines in Fig. 6, the companion-member of said clutch is feathered to the shaft 33' and may be engaged and disengaged by means of the letter 33". f w The mechanism shown in Fig. 7 is the construction whereby the previously mentioned acceleration of the feed or longitudinal movement of the spindle after the rings have passed the tools, is obtained. A planetary gear forms a portion of this mechanism and the constructionis as follows Gear 28 is normally loose upon its shaft 35, and is provided with a sleeve 28 the cup-member 28" 'of a cone-friction clutch. The cone-member 28" of said clutch is longitudinally-movable upon shaft 35, but non-revolubly attached thereto by means of the key 36, which passes through a slot in said shaft 35. Upon the outer end of said shaft,'is afiixed a cylinder 37, in which is a piston 38, having a rod 39 'that projects, into the shaft 35which is bored out at this endand the inner end of said rod 39 bears against the key 36, and when compressed air is admitted to said cylinder through the port 40, it moves the piston accordingly and causes member 28" to engage member 28" of the clutch. Upon having '43, and this holds said sleeve stationary when the clutch (28 28") is not engaged.-tha t is to say,during the slowspeed.

To one face. of gear 28 is revolubly at tached a pinion 44, which meshes with pinions 41 and 42. When said clutch is disengaged and gear 28 is revolvedgear 42 being held stationary by the ratchet, as

aforesaid-gear 44 is thereby caused to revolve, and this transmits a slow motion to gear 41 and to the shaft 35, to which said gear 41 is rigidly aflixed. When, however, the clutch 28", 28" isengaged, this causes all of said gearing shown in Fig. 7 to revolve in unison and. at a much more rapid speed than that at which it formerly moved. It will-be readily understood that this difference of speed is communicated to the cam-wheel 14, and through it, to the longitudinal movement of the spindle and the thereto-attached chuck 4. The slow movement above set forth takes placewhile the chuck is passing, and the ring therein is being operated upon by the turning-tool. The rapid speed is employed while the ring is being operated upon by the grinding wheel and subsequent thereto until the return of the spindle, and chuck to its original or starting position.

As, originally stated, pulley 19 is belted to suitable power and revolves continuously, andmeans are provided whereby a manually-actuated lever causes air to enter the cylinder 45, which is attached to shaft 20, and this causes the engagement of the clutchmember 19 with saidpulley and starts the machine to operating. Means are also provided for automatically causing the acceleration of feed above-mentioned, and also for i automatically stopping the machine at the completion of the work upon the ring. The mechanism whereby these several functions are accomplished will now be set forth.

As previously stated, clutch-members 19, 20 are engaged by pneumatic actuation,

through the. medium, of cylinder 45 and clutch-members 28", 28 are engaged by pneumatic actuation through cylinder 37. It will thus be understood that pneumatic actuation is'mainly employed for causing and controlling the various functionspf my machine.-

For the purpose of supplying air to the various cylinders 5, 37 and 45, a pipe 46- see Figs. 15, 16 and 17which may be connected to any suitable air-supply, leads to the front portion of the machine, and one branch 47 thereof leads to cylinder 5, and

in same is interposed a three-way cock 47 which is always manually operated for the purpose of actuating chuck 4. To another branch 48 of said pipe, is connected a manifold 48, having two outlets, to one of which is connected a three-way valve 49, and to the other is connected a like valve 50. Each of said valves is provided with a slotted lever 49 and 50 respectively, which are turned to one position to cause the passage of air to said cylinders, to another position, to

permit the escape of air from said cylinders.

From valve 50 a pipe 52 leads to the starting-cylinder 45, and from valve 49 a pipe 53 leads to the feed-accelerating cylinder 37,

Upon a suitable bracket at the front of the machine, is mounted a starting-lever, see Figs. 11 and 12rthe handle 54 of which passes through the slot in valve-lever50 and. serves to actuate said lever for the passage of air to and the discharge of same from said cylinder 45. When the machine is to be started for operation, the ringis clamped in the chuck by admitting air to v cylinder 5 through valve 47 Lever 54 is then placed in the starting position,-as

1 shown in the draWings,-this actuates valve 50 so as to cause the air to pass through the same into cylinder 45, and to set the clutch 19, 20, thus putting the machine in motion. Lever 54 is mounted upon a shaft 55, which has a bearing at either'end in the brackets 56. The. hub 54 or sleeve of said lever 54 is provided with a short arm 57, to which is attached a stem 58, that passes through a heavy, spiral spring 59; a collar 60 is provided upon the stem 58, against which the upper end of said spring bears; the lower end of said spring, rests upon the bracket 60'. Spring 59 has an expansive action, and, as the lev'ezg;,is brought to the starting position shown, said spring is compressed and tends to throw said lever back again tothe stop or non-operative position, and toprevent this, the hub 54 of said lever is provided with a downwardly-extending branch 61, and a detent 61." which is carried by the latch 62 is provided, to engage the lower end of said branch, as shown in Fig. 12. Said latch 62 is spring-held in the engaging position shown,by the spring 63, .one end of which rests upon the base 56 and the other end bears upon the lower side of said latch 62.. Intermediate said ends, said spring is coiled around the fulcrum or hinge-end-of said latch, through WhlCh the fulcrum-pin 62 passes to secure said latch to the upwardly-extending lugs 56 of said base. Branch 61 is provided with a lug 64, to which is attached a pawl 65, the free end of which rests upon the'latch 62. Said pawl is pr ovided with a. lever 66 which extends outward into proximity to the end of camwheel 14 and encroaches upon the path of anj as said pin 67 comes into contact with said le- War 66, said lever is raised, and pawl is .thereby depressed, thus lowering the latch 62, and disengaging same from branch 61, and permitting the expansive reaction of spring 59 to throw starting-lever 54 back to the other limit of its movement, as shown in dotted lines in Fig. 12, which stops the machine. 'In order to limit said backward movement of said lever, I provide a stoparm 68 upon the hub of lever 54, and arrange the same to contact with the stop 69. By means of the set-screw 70 passing through said arm, said backward movement may be regulated to a minute degree. Said backward movement of lever 54 actuates valve-lever 50, and permits the discharge of air from cylinder 45 back through the three-way valve 50, and this causes a disengagement of clutch-members 19, 20. An actuating dog 71 is aflixed to the hub 54', for a purpose which will presently be set forth.

The accelerating mechanism and equipment whereby it is automatically actuated, is as followsz-Upon the same shaft 55 on which the starting-lever 5.4 is mounted, an accelerating lever 72 is also mounted. The handle of said lever passes through the valve-lever 49 and serves to actuate the same for the passage of air through valve 49. Upon the hub 72' of said lever 72, is formed an arm 73, to which is secured the upper end of a stem 74, that passes through a spiral spring 75, the upper end of which spring bears against the lower face of a shoulder 76, upon the stem 74. The lower end of said spring rests upon the adjustable sleeve 77, which passes through the bracket 78.

The action of spring 75 is, to carry lever 72 to the position shown in dotted linesin Fig. 13, this being the position which would place valve-lever 49 in the position to allow the air to pass through valve 49 to cylinder 37, and cause an acceleration of the feed. When the machine is first started, however, and until the piston-ring has passed the turning-tools, this action is not desired, and; to prevent it, hub 72 is provided with a downwardly-extending limb 79, the lower end of which is adapted to be engaged by a detent 79 which is carried by the latch 80,

which latch is spring held in the engaged position shown, by means of the spring 81, one end of which rests upon the base-56, the other end being inserted beneath said latch 80; intermediate said ends, said spring 63 is coiled around the fulcrum or hinge-end of said latch through which the fulcrumpin 80 passesv to secure said latch to said upwardly-extending lugs 56.

A trip-lever 82 is provided for disengaging the latch 80, the inner end of which lever projects inward and encroaches upon the path of a pin 83, which is attached to the end of the cam-wheel 14. Said lever 82 is provided with a fulcrum or bearing formed upon the lever 72, and to the outer end of said lever is attached a rod 84, which projects downward with its lower end resting upon the latch 80; an eye 85 is provided upon the limb 79, through which said rod passes loosely. A spiral spring 86 surrounds said rod, and the upper end'of said spring bears against the shoulder 87. The action of said spring is expansive and tends to throw the outer end of lever 82 upward, and to keep same in the position shown in Figs. 11 and 13. Pin 83 is so positioned that it will come. into contact with lever 82 immediately after the piston-ring 18 has passed the tool 19 and immediately at the 4 beginning of the grinding operation. When said contact takes place, the inner contactend of said lever is moved upward, the outer end is moved downward, and thus, through the medium of rod 84, latch 80 is depressed and disengaged from limb 79, which permits spring 75 to act, and throw lever 72 to the position shown by dotted lines in Fig. 13. This actuates valve-lever 49' and causes the or engage the clutch-members 28", 28, which accelerates the speed of the cam-wheel 14 and quickens the longitudinal movement compressed air to enter cylinder37, and set I of the barrel 8 and the other related portions of the spindle, in the manner previously set forth. I

As previously stated, the machine is started by a manual actuation, of the startinglever 54, but it is stopped automatically through the actuation of the latch 62 by the lever, 66, when pin 67 comes into contact therewith, and lever 54 is actuated by spring 59 and moved to the stop position, as indi-' cated by dotted lines in Fig. 12.- A function of said spring-actuated movement of lever 54 is, to carry lever 72 back to the slow position, and this function is accomplished in the following manner Upon the hub 54' is formed a dog 71, which has been previously mentioned; upon hub 72 is formed an inter-engaging dog 88, and when lever 54 is in the operating position shown, and lever 72 is in the accelerating position shown,

in dotted lines in Fig. 13, the contiguous faces of these dogs are in contact, and when limb 61 is released by the latch 62, spring 59 is suflicientlystrongto overcome the action of spring 75 and to move both levers 54 and 72, and when said levers are thus moved, valves 49 and 50 are in the position to allow the escape of air from their respective cylinders 37 and 45. The whole mechanism is then in a position to be restarted and to repeat the various operations set forth.

In order to prevent barrel 8 from revolving within its bearings 11 and 12, the

' collar 16 is provided with a tongue 16 (Fig.

' work.

5) which projects into the slot 16 (Fig. 1) Y in the frame of the machine in which it is free to move longitudinally.

It may, at times,.-be desirable to set the machine in motion without employing the starting-lever and admitting air to the cylinder 57; in this case, the foot-lever 89. is employed, which acts through the carrierrod 90, lever 91 and the stem 92 upon the clutch-member 21, and moves same into engagement with pulley 19, thus starting the machine. Vhen the foot is taken from said lever 89, the reaction of spring 93,Fig. 10causes the disengagement of said clutch.

In order that the periphery of the ring may be as smooth as it is possible to make it with the turning tool, it is necessary that said tool be constructed and arranged in such a way that it will not vibrate or chatter, and because of this, I employ a specially-constructed tool, enlarged views of which are given in Figs. 21, 22, 23 and 24. The construction here illustrated is as follows :I construct a tool-post having a base 94 and a housing 95, in which housing is a vertical gap or slot, adapted for the reception of two tool-holders 96 and 97, as shown in Figs. 23 and 24. The lower end of saidholders is suitably bored for the reception of a pin or bolt 98, which passes through both sides of the housing and secures said holders in such manner that the upper end of each thereof is adjustable inwardly and outwardly. In each of' said holders is formed a tool-slot 99 for the reception of a cutter 100 and 101, which are secured inosition by means of set-screws 102.

h'rough each end of said holders, a cylindrical nut 103 is inserted, for the reception of an adjusting-screw. Passing through the housing 95, at the rear of each toolholder, are two adjusting-screws 104, 105. The inner end of each screw 104 bears against its respective holder and each screw 105 passes through the nut 103 in its respective holder. WVhen one of the cutters is to be advanced to take a heavier cut, the screw 105 is loosened or unscrewed to the desired amount, then the screw 104 is ad vanced so as to'move the holder and its cutter outward; both screws are then tightened, thus securing the desired adjustment. Two cutters are provided, for the reason that it has been found that a much smoother surface is attained by the use of two tools, each removing a small amount of stock, than can be attained with one tool doing the same It will be readily understood that in the construction shown, one tool is adjusted slightly in advance of the other. The screws 105 are provided with graduations 106, and in proximity thereto is located a Vernier 107, to indicate the degree of adjustment of said cutters. For the purpose of mounting said tool-post upon the frame of the machine, I provide rthereon a toolplaten 108, in which are formed suitable T- slots 109 for the reception of bolts 110, adapted to occupy said slotsand the slots 111 in the base of the post, and thus serve to secure said tool-post firmly in position. It will be readily seen that the tool-post thus constructed is adjustable, as a Whole, upon the platen.

The grinding-wheel 20 and the Way in which the stock or frame is adjustably mounted upon the frame of the machine,

will be readily understood by a reference to Figs. 19 and 20. Said wheel is mounted upon a suitably constructed arbor, for which bearings 112 are formed upon a base 113. Bed 1 is provided with a suitable-shear for the reception of said wheel-stock, as shown in the vertical section in Fig. 20. Said shear is composed of two ways, 114 and 115, upon which the wheel-stock is adapted to slide on a line perpendicular to the axis of chuck 4, thus providing for an adjustment of the grinding-wheel, relative to said chuck 4. Intermediate said ways, base 113 is provided, upon its under side, with a rack 116, with which the adjusting-pinion 117 meshes. The shaft 118 of said pinion is revolubly mounted in a sleeve 119, which passes through way 115. The outer end of said sleeve is formed into a case and bearing 120, for the worm-wheel 121; and the cooperating worm 1 22. The outer end of the shaft of said worm 122 is provided with a knurled hand-wheel 123, for the purpose of revolving said worm and the wheel 121, also pinion 116, and, by this construction, the wheelstock and wheel 20 are readily, quickly and minutely adjusted. f

It is desirable that any wear in the various parts of this adjusting-mechanism be automatically taken up, and that the Wheel 20 should accurately respond to the desired adjustments, as provided and arranged for by said hand-wheel 123, and to secure this object, a cable 124 is secured in any suitable manner to the wheelstock, then carried horizontally backward over a pulley 125 in the frame of the machine; a weight 126 is then attached to said cable, to exert tension thereon, thus keeping the teeth of rack 116 always firmly in contact with the teeth of pinion 117, thus insuring an accurate transmission from said pinion to said rack.

In order to give to the wheel-stock a sufficient amount of weight and inertia to prevent vibration, a suitable weight 127 is attached thereto. A portion of the hand wheel 123 is provided with graduations 127,

and in proximity thereto, a Vernier 127 is located, to indicate the degree of adjustment.

Beneath the chuck 4, is placed an adjustable gage 128, upon which the ring rests while it is being chucked, to insure the proper centering of same within the chuck.

30 I such ring and to present same to the action 1. In a finishing machine for the periphery of piston rings, the combination of a turning-tool and a grinding-wheel arranged in proximity to each other, with a revoluble, reciprocable chuck arranged in proximity to said tool and said wheel, adapted to hold such ring and to present same to the action of said tool and, said wheel, means for im pa'rtingto said chuck said revolving and reciprocating movements, for the purpose set forth, and means imparting to said reciprocating movement different rates of speed during the respective operations of said tool andsaid wheel.

2. In a finishing machine for the periphery of piston rings, the combination of a turning-tool and a grinding-wheel arranged 1n juxtaposition to each other, with a revoluble, reciprocable chuck arranged intermediate said tool and said wheel, adapted to hold of said tool and wheel, means for imparting to said chuck a revolving and a reciproeating movement, for the purposeset forth, and means imparting to said reciprocating I movement differential rates of speed during the respective operations of said tool and said wheel.

3. In a finishing machine for the periphery of piston rings, the combination of a turning-tool and a grinding-wheel, arranged in proximity to each other, with a revoluble, reclprocable chuck arranged in proximity to said tool and wheel, adapted to hold such ring and to feed same, first to the action of said tool, then to the action of said grindingwheel, and means automatically causing an increase in the speed of such feed or longitudinaLmovement during process of grinding and when the chuck is returning to its original position.

4. In a finishing machine for the peri herv of piston rings, the combination'o a turning-tool and a grinding-wheel, adjustably arranged in proximity to each other, With a revoluble, reciprocable chuck, arranged in proximity to said tool and wheel, adapted to hold suchring, and to feed the same, first to the operation of said tool, then, in a more rapid movement, to the operation of said grinding-wheel, and means antomatically causing the motions of said chuck to cease at the completion of said operation.

5. In a finishing machine for the periph- .ery of piston'rings, the combination of a turning tool and a grinding wheel arranged in juxtaposition to each other, with a revoluble rcciprocable chuck arranged intermediate said tool and said wheel adapted to hold such ring and to present the same to the action of said tool then to the action of said wheel, means insuring the proper positioning of said ring within said chuck, means for imparting to said chuck a revolving and a reciprocating movement and means causing said reciprocating movement to differentiate during the respective operations of said tool and said wheel \for the purpose set forth.

In testlmony whereof I afiix myslgnature in presence of two witnesses.

DAVID F. DOMIZI.

Witnesses I I T. J. DEMPEY, I l G. K. BIGLER. 

